Prime vs Zoom 28mm, 50mm, 85mm vs 24-70 2.8

[goodguy]

I've been told that these standard AF f1.8D primes focus faster than the corresponding AF-S f1.8G lenses, but the AF-S motor in the lens is apparently more accurate and realizes even small changes in focus without problem, which the AF lenses dont.

Before owning the Nikon 50mm 1.4D I owned the 50mm 1.8G and while I never really timed it to me it felt like the D lens is faster to AF, it feels instantaneous compared to the G lens but again it isn't a scientific experiment just the way it feels.